Hello Don.
I recently upgraded my system, and we have a few components in common, the CPU and the motherboard, both of which I think are terrific. Like the others, I can't help but feel the the GPU will be your Achilles' heel.
I had a 1080ti, but wanted to be able to fly MSFS in 4k, (which it did) and VR, (with which it would have struggled) so I bit the bullet and bought an Nvidia 3090. I know it's like using a hammer to crack a walnut, but I wanted the new card then and there, and I felt that as both the available 3080, and the 3090 prices were inflated because of the crypto miners, I opted for the 3090, as the markup on it, was not as savage as on the 3080.
The other area I boosted was RAM. I had 32GB of DDR4 in the machine already, and boosted it up with another 32GB to make 64GB. All of that really makes my PC, and MSFS sing. Overkill perhaps, but if you could go to 32GB, I think it could make a difference.
And, I agree with Nick and the others about M.2 SSD drives. Your new motherboard wil accommodate two, and the prices aren't too bad now. I have a 1TB, and a 2TB card. The 1 has the OS, and some other programs, the 2 has my flight sims.
But, really at the end of the day, it's your system, however I strongly suggest another look at the GPU